Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b58be46a6ed35d…

MALICIOUS

PDF

74.1 KB Created: 2020-12-18 11:58:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0dcb8df521b6f7c6708a26c7385568db SHA-1: aa821164be1a868567d4d479b318dc9b0b4e6c6b SHA-256: d4b58be46a6ed35dfcdeb77303e865a617cf65fbd48be65f9379387c66f2e55c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary links, 'https://traffine.ru/aws?utm_term=computer+basic+gk+questions+with+answers', suggests a lure related to computer knowledge questions. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the link farm structure point towards an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffine.ru/aws?utm_term=computer+basic+gk+questions+with+answers PDF link annotation
    • https://raboxodibol.weebly.com/uploads/1/3/4/0/134096122/219eefa6c443.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc142187d0c8f249d4331a3/t/5fc6fbaf788a962b7c233793/1606876079577/realm_of_magic_mods_sims_4.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/algarve_tourist_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c0d766-d18c-4e8d-be96-66239b7fe14d/21917962806.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/zero_zero_zero_show_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/house_bulldozed_in_hitchhiker_s_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd4b79189c5e4b69235aae/1606241146252/static_discharge_straps.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/font_blippo_std_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e805379-d34e-4313-8a8d-fccd810b4365/nuliresedokujofalira.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/fundamentals_of_molecular_virology_nicholas_h._acheson.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/offline_dictionary_for_laptop.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 5640 bytes
SHA-256: 0602d7fb543d9cd67dff19d84325ecec9657c78ae603672d87fb25409770fbfc
font_01_sfnt_off0000f6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 10772 bytes
SHA-256: 7a1b022c135a3871565946cc0915a966334a90ae3fa5aea8fc8c4bd657cca961

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